Bilstein shocks can be rebuilt and this is probably your better option as i don't like your chances of getting new Bilsteins that match the spec of the originals. There are a few Bilstein specialists around depending upon what state your in.
Corsa

Yes, they can be rebuilt not sure on price though. I know someone who bought a pair of bilstein struts off holden for a vn and it cost them about $800 so the shocks probly won't be cheap but bilstein is pretty much the best money can buy.

Bilstein shocks can be rebuilt and this is probably your better option as i don't like your chances of getting new Bilsteins that match the spec of the originals. There are a few Bilstein specialists around depending upon what state your in.
Corsa